By a News Reporter-Staff News Editor at Physics Week -- Current study results on Astrophysics Research have been published. According to news reporting out of Shanghai, People's Republic of China, by VerticalNews editors, the research stated, "The formalism of the earlier fatigue crack growth models is retained to account for multiscaling of the fatigue process that involves the creation of macrocracks from the accumulation of micro damage. The effects of at least two scales, say micro to macro, must be accounted for."
Our news journalists obtained a quote from the research from the East China University of Science and Technology, "The same data can thus be reinterpreted by the invariancy of the transitional stress intensity factors such that the microcracking and macrocracking data would lie on a straight line. The threshold associated with the sigmoid curve disappears. Scale segmentation is shown to be a necessity for addressing multiscale energy dissipative processes such as fatigue and creep. Path independency and energy release rate are monoscale criteria that can lead to unphysical results, violating the first principles. Application of monoscale failure or fracture criteria to nanomaterials is taking toll at the expense of manufacturing super strength and light materials and structural components. This brief view is offered in the spirit of much needed additional research for the reinforcement of materials by creating nanoscale interfaces with sustainable time in service."
According to the news editors, the research concluded: "The step by step consideraton at the different scales may offer a better understanding of the test data and their limitations with reference to space and time."
For more information on this research see: From monoscale to multiscale modeling of fatigue crack growth: Stress and energy density factor. Science China-Physics Mechanics & Astronomy, 2014;57(1):39-50. Science China-Physics Mechanics & Astronomy can be contacted at: Science Press, 16 Donghuangchenggen North St, Beijing 100717, Peoples R China.
Our news journalists report that additional information may be obtained by contacting G.C. Sih, E. China University of Science & Technology, Sch Mech Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, People's Republic of China.
Keywords for this news article include: Asia, Shanghai, Astrophysics Research, People's Republic of China
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